"The system adds up to 82PS (60kW) of recovered energy".
Well actually kW is a measurement of power not energy. To be technically correct the energy should be stated in kW-Hr. Flywheels, like ultracapacitors are relatively high power but low energy devices. The power number will look more impressive than the (real) energy number. By the way, what is the energy storage capability of the system?

A consortium of UK automotive companies is showcasing a prototype flywheel hybrid system for premium vehicles (FHSPV) at the Low Carbon Vehicle event at Millbrook (UK) on 15 September. The system adds up to 82PS (60kW) of recovered energy and is predicted to demonstrate fuel economy gains of 20%...